We do not warranty our barrels with reloads. Your chamber is 5.56 Nato. I have only heard of someone with this issue a couple times in the past, so I don't believe that it's a barrel issue. I'm not a reloader, so I had to do some research on the issue, below are some of the possible solutions that I found:
Do you have a case gauge? Several have had the same issue if they're improperly sized at the shoulder.
Are you trimming your brass? The max case length is 1.760".
If anyone here has first hand experience, please jump in and advise. I am completely out of my wheelhouse on this issue.
Sorry I don't have better information to pass along, maybe some of the members can help more.